Qualification in Immunohistochemistry (QIHC) Practice Exam

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What characterizes an optimal staining protocol for IHC assays?

Robustness - minimize variations in staining result; correctness - correctly visualize the antigen in tissue at both high and low expression

Maximum staining intensity regardless of background

Shortest protocol

Uses the most expensive reagents

An optimal IHC staining protocol is defined by robustness and accuracy. Robustness means the results are reproducible and stable across different samples, runs, and minor variations in tissue processing or reagent performance. Accuracy, or correctness, means the staining truly reflects the presence and distribution of the target antigen, detectable across a range of expression levels—from very low to very high—without being overwhelmed by non-specific background.

This combination ensures reliable interpretation: you can trust that a positive stain truly indicates the antigen and that negatives aren’t due to inconsistent processing.

Choosing maximal staining intensity without regard to background can lead to non-specific staining and false positives; a very short protocol may skip essential steps that preserve epitopes or block non-specific binding, reducing sensitivity and specificity; and using the most expensive reagents does not guarantee better results and increases cost without improving accuracy or reproducibility.